Added support for new HTML5 structural tags to "pass through" without being wrapped in a <p>

src/showdown.js

@@ -215,8 +215,8 @@ var _HashHTMLBlocks = function(text) {
 	// "paragraphs" that are wrapped in non-block-level tags, such as anchors,
 	// phrase emphasis, and spans. The list of tags we're looking for is
 	// hard-coded:
-	var block_tags_a = "p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math|ins|del|style";
-	var block_tags_b = "p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math|style";
+	var block_tags_a = "p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math|ins|del|style|section|header|footer|nav|article|aside";
+	var block_tags_b = "p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math|style|section|header|footer|nav|article|aside";
 
 	// First, look for nested blocks, e.g.:
 	//   <div>
@@ -265,7 +265,7 @@ var _HashHTMLBlocks = function(text) {
 		)						// attacklab: there are sentinel newlines at end of document
 		/gm,function(){...}};
 	*/
-	text = text.replace(/^(<(p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math|style)\b[^\r]*?.*<\/\2>[ \t]*(?=\n+)\n)/gm,hashElement);
+	text = text.replace(/^(<(p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math|style|section|header|footer|nav|article|aside)\b[^\r]*?.*<\/\2>[ \t]*(?=\n+)\n)/gm,hashElement);
 
 	// Special case just for <hr />. It was easier to make a special case than
 	// to make the other regex more complicated.

test/cases/html5-strutural-tags.html

@@ -0,0 +1,16 @@
+
+<p>These HTML5 tags should pass through just fine.</p>
+
+<section>hello</section>
+
+<header>head</header>
+
+<footer>footsies</footer>
+
+<nav>navigation</nav>
+
+<article>read me</article>
+
+<aside>ignore me</aside>
+
+<p>the end</p>

test/cases/html5-strutural-tags.md

@@ -0,0 +1,11 @@
+
+These HTML5 tags should pass through just fine.
+
+<section>hello</section>
+<header>head</header>
+<footer>footsies</footer>
+<nav>navigation</nav>
+<article>read me</article>
+<aside>ignore me</aside>
+
+the end